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<td ><a href="../qtdoc/index.html">Qt 5.14</a></td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-module.html">C++ Classes</a></td><td >QPolygonF</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#related-non-members">Related Non-Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QPolygonF Class</h1>
<!-- $$$QPolygonF-brief -->
<p>The QPolygonF class provides a vector of points using floating point precision. <a href="#details">More...</a></p>
<!-- @@@QPolygonF -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QPolygonF&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += gui</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="../qtcore/qvector.html">QVector</a></td></tr></table></div><ul>
<li><a href="qpolygonf-members.html">List of all members, including inherited members</a></li>
</ul>
<p><b>Note:</b> All functions in this class are <a href="../qtdoc/threads-reentrancy.html">reentrant</a>.</p>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF-6">QPolygonF</a></b>(const QPolygonF &amp;<i>polygon</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF-5">QPolygonF</a></b>(const QPolygon &amp;<i>polygon</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF-4">QPolygonF</a></b>(const QRectF &amp;<i>rectangle</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF-2">QPolygonF</a></b>(const QVector&lt;QPointF&gt; &amp;<i>points</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF-1">QPolygonF</a></b>(int <i>size</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#QPolygonF">QPolygonF</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#dtor.QPolygonF">~QPolygonF</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRectF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#boundingRect">boundingRect</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#containsPoint">containsPoint</a></b>(const QPointF &amp;<i>point</i>, Qt::FillRule <i>fillRule</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygonF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#intersected">intersected</a></b>(const QPolygonF &amp;<i>r</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#intersects">intersects</a></b>(const QPolygonF &amp;<i>p</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#isClosed">isClosed</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygonF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#subtracted">subtracted</a></b>(const QPolygonF &amp;<i>r</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#swap">swap</a></b>(QPolygonF &amp;<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygon </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#toPolygon">toPolygon</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#translate">translate</a></b>(const QPointF &amp;<i>offset</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#translate-1">translate</a></b>(qreal <i>dx</i>, qreal <i>dy</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygonF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#translated">translated</a></b>(const QPointF &amp;<i>offset</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygonF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#translated-1">translated</a></b>(qreal <i>dx</i>, qreal <i>dy</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPolygonF </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#united">united</a></b>(const QPolygonF &amp;<i>r</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#operator-QVariant">operator QVariant</a></b>() const</td></tr>
</table></div>
<a name="related-non-members"></a>
<h2 id="related-non-members">Related Non-Members</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> QDataStream &amp;</td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#operator-lt-lt-16">operator&lt;&lt;</a></b>(QDataStream &amp;<i>stream</i>, const QPolygonF &amp;<i>polygon</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QDataStream &amp;</td><td class="memItemRight bottomAlign"><b><a href="qpolygonf.html#operator-gt-gt">operator&gt;&gt;</a></b>(QDataStream &amp;<i>stream</i>, QPolygonF &amp;<i>polygon</i>)</td></tr>
</table></div>
<a name="details"></a>
<!-- $$$QPolygonF-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>A QPolygonF is a <a href="../qtcore/qvector.html">QVector</a>&lt;<a href="../qtcore/qpointf.html">QPointF</a>&gt;. The easiest way to add points to a QPolygonF is to use its streaming operator, as illustrated below:</p>
<pre class="cpp">

          <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> polygon;
          polygon <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">10.4</span><span class="operator">,</span> <span class="number">20.5</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">20.2</span><span class="operator">,</span> <span class="number">30.2</span>);

</pre>
<p>In addition to the functions provided by <a href="../qtcore/qvector.html">QVector</a>, QPolygonF provides the <a href="qpolygonf.html#boundingRect">boundingRect</a>() and <a href="qpolygonf.html#translate">translate</a>() functions for geometry operations. Use the <a href="qmatrix.html#map">QMatrix::map</a>() function for more general transformations of QPolygonFs.</p>
<p>QPolygonF also provides the <a href="qpolygonf.html#isClosed">isClosed</a>() function to determine whether a polygon's start and end points are the same, and the <a href="qpolygonf.html#toPolygon">toPolygon</a>() function returning an integer precision copy of this polygon.</p>
<p>The QPolygonF class is <a href="../qtcore/implicit-sharing.html">implicitly shared</a>.</p>
</div>
<p><b>See also </b><a href="../qtcore/qvector.html">QVector</a>, <a href="qpolygon.html">QPolygon</a>, and <a href="../qtcore/qlinef.html">QLineF</a>.</p>
<!-- @@@QPolygonF -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QPolygonF$$$QPolygonFconstQPolygonF& -->
<h3 class="fn" id="QPolygonF-6"><a name="QPolygonF-6"></a>QPolygonF::<span class="name">QPolygonF</span>(const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>polygon</i>)</h3>
<p>Constructs a copy of the given <i>polygon</i>.</p>
<!-- @@@QPolygonF -->
<!-- $$$QPolygonF$$$QPolygonFconstQPolygon& -->
<h3 class="fn" id="QPolygonF-5"><a name="QPolygonF-5"></a>QPolygonF::<span class="name">QPolygonF</span>(const <span class="type"><a href="qpolygon.html">QPolygon</a></span> &amp;<i>polygon</i>)</h3>
<p>Constructs a float based polygon from the specified integer based <i>polygon</i>.</p>
<p><b>See also </b><a href="qpolygonf.html#toPolygon">toPolygon</a>().</p>
<!-- @@@QPolygonF -->
<!-- $$$QPolygonF$$$QPolygonFconstQRectF& -->
<h3 class="fn" id="QPolygonF-4"><a name="QPolygonF-4"></a>QPolygonF::<span class="name">QPolygonF</span>(const <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> &amp;<i>rectangle</i>)</h3>
<p>Constructs a closed polygon from the specified <i>rectangle</i>.</p>
<p>The polygon contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex.</p>
<p><b>See also </b><a href="qpolygonf.html#isClosed">isClosed</a>().</p>
<!-- @@@QPolygonF -->
<!-- $$$QPolygonF$$$QPolygonFconstQVector<QPointF>& -->
<h3 class="fn" id="QPolygonF-2"><a name="QPolygonF-2"></a>QPolygonF::<span class="name">QPolygonF</span>(const <span class="type"><a href="../qtcore/qvector.html#QVector">QVector</a></span>&lt;<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>&gt; &amp;<i>points</i>)</h3>
<p>Constructs a polygon containing the specified <i>points</i>.</p>
<!-- @@@QPolygonF -->
<!-- $$$QPolygonF$$$QPolygonFint -->
<h3 class="fn" id="QPolygonF-1"><a name="QPolygonF-1"></a>QPolygonF::<span class="name">QPolygonF</span>(<span class="type">int</span> <i>size</i>)</h3>
<p>Constructs a polygon of the given <i>size</i>. Creates an empty polygon if <i>size</i> == 0.</p>
<p><b>See also </b><a href="../qtcore/qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<!-- @@@QPolygonF -->
<!-- $$$QPolygonF[overload1]$$$QPolygonF -->
<h3 class="fn" id="QPolygonF"><a name="QPolygonF"></a>QPolygonF::<span class="name">QPolygonF</span>()</h3>
<p>Constructs a polygon with no points.</p>
<p><b>See also </b><a href="../qtcore/qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<!-- @@@QPolygonF -->
<!-- $$$~QPolygonF[overload1]$$$~QPolygonF -->
<h3 class="fn" id="dtor.QPolygonF"><a name="dtor.QPolygonF"></a>QPolygonF::<span class="name">~QPolygonF</span>()</h3>
<p>Destroys the polygon.</p>
<!-- @@@~QPolygonF -->
<!-- $$$boundingRect[overload1]$$$boundingRect -->
<h3 class="fn" id="boundingRect"><a name="boundingRect"></a><span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> QPolygonF::<span class="name">boundingRect</span>() const</h3>
<p>Returns the bounding rectangle of the polygon, or <a href="../qtcore/qrectf.html">QRectF</a>(0,0,0,0) if the polygon is empty.</p>
<p><b>See also </b><a href="../qtcore/qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<!-- @@@boundingRect -->
<!-- $$$containsPoint[overload1]$$$containsPointconstQPointF&Qt::FillRule -->
<h3 class="fn" id="containsPoint"><a name="containsPoint"></a><span class="type">bool</span> QPolygonF::<span class="name">containsPoint</span>(const <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> &amp;<i>point</i>, <span class="type"><a href="../qtcore/qt.html#FillRule-enum">Qt::FillRule</a></span> <i>fillRule</i>) const</h3>
<p>Returns <code>true</code> if the given <i>point</i> is inside the polygon according to the specified <i>fillRule</i>; otherwise returns <code>false</code>.</p>
<p>This function was introduced in Qt 4.3.</p>
<!-- @@@containsPoint -->
<!-- $$$intersected[overload1]$$$intersectedconstQPolygonF& -->
<h3 class="fn" id="intersected"><a name="intersected"></a><span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> QPolygonF::<span class="name">intersected</span>(const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>r</i>) const</h3>
<p>Returns a polygon which is the intersection of this polygon and <i>r</i>.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qpolygonf.html#intersects">intersects</a>().</p>
<!-- @@@intersected -->
<!-- $$$intersects[overload1]$$$intersectsconstQPolygonF& -->
<h3 class="fn" id="intersects"><a name="intersects"></a><span class="type">bool</span> QPolygonF::<span class="name">intersects</span>(const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>p</i>) const</h3>
<p>Returns <code>true</code> if the current polygon intersects at any point the given polygon <i>p</i>. Also returns <code>true</code> if the current polygon contains or is contained by any part of <i>p</i>.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 5.10.</p>
<p><b>See also </b><a href="qpolygonf.html#intersected">intersected</a>().</p>
<!-- @@@intersects -->
<!-- $$$isClosed[overload1]$$$isClosed -->
<h3 class="fn" id="isClosed"><a name="isClosed"></a><span class="type">bool</span> QPolygonF::<span class="name">isClosed</span>() const</h3>
<p>Returns <code>true</code> if the polygon is closed; otherwise returns <code>false</code>.</p>
<p>A polygon is said to be closed if its start point and end point are equal.</p>
<p><b>See also </b><a href="../qtcore/qvector.html#first">QVector::first</a>() and <a href="../qtcore/qvector.html#last">QVector::last</a>().</p>
<!-- @@@isClosed -->
<!-- $$$subtracted[overload1]$$$subtractedconstQPolygonF& -->
<h3 class="fn" id="subtracted"><a name="subtracted"></a><span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> QPolygonF::<span class="name">subtracted</span>(const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>r</i>) const</h3>
<p>Returns a polygon which is <i>r</i> subtracted from this polygon.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 4.3.</p>
<!-- @@@subtracted -->
<!-- $$$swap[overload1]$$$swapQPolygonF& -->
<h3 class="fn" id="swap"><a name="swap"></a><span class="type">void</span> QPolygonF::<span class="name">swap</span>(<span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>other</i>)</h3>
<p>Swaps polygon <i>other</i> with this polygon. This operation is very fast and never fails.</p>
<p>This function was introduced in Qt 4.8.</p>
<!-- @@@swap -->
<!-- $$$toPolygon[overload1]$$$toPolygon -->
<h3 class="fn" id="toPolygon"><a name="toPolygon"></a><span class="type"><a href="qpolygon.html">QPolygon</a></span> QPolygonF::<span class="name">toPolygon</span>() const</h3>
<p>Creates and returns a <a href="qpolygon.html">QPolygon</a> by converting each <a href="../qtcore/qpointf.html">QPointF</a> to a <a href="../qtcore/qpoint.html">QPoint</a>.</p>
<p><b>See also </b><a href="../qtcore/qpointf.html#toPoint">QPointF::toPoint</a>().</p>
<!-- @@@toPolygon -->
<!-- $$$translate[overload1]$$$translateconstQPointF& -->
<h3 class="fn" id="translate"><a name="translate"></a><span class="type">void</span> QPolygonF::<span class="name">translate</span>(const <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> &amp;<i>offset</i>)</h3>
<p>Translate all points in the polygon by the given <i>offset</i>.</p>
<p><b>See also </b><a href="qpolygonf.html#translated">translated</a>().</p>
<!-- @@@translate -->
<!-- $$$translate$$$translateqrealqreal -->
<h3 class="fn" id="translate-1"><a name="translate-1"></a><span class="type">void</span> QPolygonF::<span class="name">translate</span>(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> <i>dx</i>, <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> <i>dy</i>)</h3>
<p>This is an overloaded function.</p>
<p>Translates all points in the polygon by (<i>dx</i>, <i>dy</i>).</p>
<p><b>See also </b><a href="qpolygonf.html#translated">translated</a>().</p>
<!-- @@@translate -->
<!-- $$$translated[overload1]$$$translatedconstQPointF& -->
<h3 class="fn" id="translated"><a name="translated"></a><span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> QPolygonF::<span class="name">translated</span>(const <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> &amp;<i>offset</i>) const</h3>
<p>Returns a copy of the polygon that is translated by the given <i>offset</i>.</p>
<p>This function was introduced in Qt 4.6.</p>
<p><b>See also </b><a href="qpolygonf.html#translate">translate</a>().</p>
<!-- @@@translated -->
<!-- $$$translated$$$translatedqrealqreal -->
<h3 class="fn" id="translated-1"><a name="translated-1"></a><span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> QPolygonF::<span class="name">translated</span>(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> <i>dx</i>, <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> <i>dy</i>) const</h3>
<p>This is an overloaded function.</p>
<p>Returns a copy of the polygon that is translated by (<i>dx</i>, <i>dy</i>).</p>
<p>This function was introduced in Qt 4.6.</p>
<p><b>See also </b><a href="qpolygonf.html#translate">translate</a>().</p>
<!-- @@@translated -->
<!-- $$$united[overload1]$$$unitedconstQPolygonF& -->
<h3 class="fn" id="united"><a name="united"></a><span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> QPolygonF::<span class="name">united</span>(const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>r</i>) const</h3>
<p>Returns a polygon which is the union of this polygon and <i>r</i>.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qpolygonf.html#intersected">intersected</a>() and <a href="qpolygonf.html#subtracted">subtracted</a>().</p>
<!-- @@@united -->
<!-- $$$operator QVariant[overload1]$$$operator QVariant -->
<h3 class="fn" id="operator-QVariant"><a name="operator-QVariant"></a><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> QPolygonF::<span class="name">operator QVariant</span>() const</h3>
<p>Returns the polygon as a <a href="../qtcore/qvariant.html">QVariant</a>.</p>
<!-- @@@operator QVariant -->
</div>
<div class="relnonmem">
<h2>Related Non-Members</h2>
<!-- $$$operator<<$$$operator<<QDataStream&constQPolygonF& -->
<h3 class="fn" id="operator-lt-lt-16"><a name="operator-lt-lt-16"></a><span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> &amp;<span class="name">operator&lt;&lt;</span>(<span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> &amp;<i>stream</i>, const <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>polygon</i>)</h3>
<p>Writes the given <i>polygon</i> to the given <i>stream</i>, and returns a reference to the stream.</p>
<p><b>See also </b><a href="../qtcore/datastreamformat.html">Serializing Qt Data Types</a>.</p>
<!-- @@@operator<< -->
<!-- $$$operator>>[overload1]$$$operator>>QDataStream&QPolygonF& -->
<h3 class="fn" id="operator-gt-gt"><a name="operator-gt-gt"></a><span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> &amp;<span class="name">operator&gt;&gt;</span>(<span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> &amp;<i>stream</i>, <span class="type"><a href="qpolygonf.html#QPolygonF">QPolygonF</a></span> &amp;<i>polygon</i>)</h3>
<p>Reads a polygon from the given <i>stream</i> into the given <i>polygon</i>, and returns a reference to the stream.</p>
<p><b>See also </b><a href="../qtcore/datastreamformat.html">Serializing Qt Data Types</a>.</p>
<!-- @@@operator>> -->
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